CN108760059B - Detection method, detection device and detection system of laser projector - Google Patents
Detection method, detection device and detection system of laser projector Download PDFInfo
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses a detection method of a laser projector. The detection method comprises the following steps: controlling a laser projector to project laser to a predetermined plane; acquiring a laser pattern modulated by a predetermined plane; selecting a highlight area in the laser pattern according to the gray information of the laser pattern; acquiring the energy of laser projected to a high-energy area by a laser projector to serve as detection energy, wherein the high-energy area is an area corresponding to the highlight area on a preset plane; and judging whether the projection energy of the laser projector meets the safety standard or not according to the detection energy. The invention also discloses a detection device of the laser projector and a detection system of the laser projector. Through the highlight area of selecting among the laser pattern to pinpoint the high energy region that the laser projector throws laser, and then can judge whether satisfy the safety standard through the detection energy that detects the laser projector and throw the high energy region, and need not detect the energy of all areas in the scope of throwing of laser projector, the efficiency of detection is higher.
Description
Technical Field
The invention relates to the technical field of production line testing, in particular to a detection method of a laser projector, a detection device of the laser projector and a detection system of the laser projector.
Background
If the energy of the laser projected by the laser projector is too high, the user is easily injured, so that whether the energy of the laser projected by the laser projector meets the safety standard needs to be detected, and in the detection process, all areas in the projection range of the laser projector need to be detected through the energy detection device, so that the detection efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a detection method of a laser projector, a detection device of the laser projector and a detection system of the laser projector.
The detection method of the laser projector of the embodiment of the invention comprises the following steps:
controlling the laser projector to project laser to a predetermined plane;
acquiring a laser pattern modulated by the predetermined plane;
selecting a highlight area in the laser pattern according to the gray information of the laser pattern;
acquiring the energy of laser projected to a high-energy area by the laser projector as detection energy, wherein the high-energy area is an area corresponding to the high-brightness area on the preset plane; and
and judging whether the projection energy of the laser projector meets the safety standard or not according to the detection energy.
In some embodiments, the predetermined plane is perpendicular to an optical axis of the laser projector, and the predetermined plane is at a distance in a range of [100, 2000] millimeters from a projection plane of the laser projector.
In some embodiments, the locating the highlight region in the laser pattern according to the grayscale information of the laser pattern includes:
and selecting a highlight area in the laser pattern by using a preset graphic frame so as to maximize the sum of the gray values of all pixels in the graphic frame.
In some embodiments, the graphical frame is circular and the graphical frame has a diameter of 7 millimeters.
The detection device of the laser projector of the embodiment of the invention is used for:
controlling the laser projector to project laser to a predetermined plane;
acquiring a laser pattern modulated by the predetermined plane;
selecting a highlight area in the laser pattern according to the gray information of the laser pattern;
acquiring the energy of laser projected to a high-energy area by the laser projector as detection energy, wherein the high-energy area is an area corresponding to the high-brightness area on the preset plane; and
and judging whether the projection energy of the laser projector meets the safety standard or not according to the detection energy.
In some embodiments, the predetermined plane is perpendicular to an optical axis of the laser projector, and the predetermined plane is at a distance in a range of [100, 2000] millimeters from a projection plane of the laser projector.
In certain embodiments, the detection device is further configured to:
and selecting a highlight area in the laser pattern by using a preset graphic frame so as to maximize the sum of the gray values of all pixels in the graphic frame.
In some embodiments, the graphical frame is circular and the graphical frame has a diameter of 7 millimeters.
The detection system of the laser projector of the embodiment of the invention comprises:
an infrared camera for collecting the laser pattern modulated by the predetermined plane; and
the detection device of any one of the above embodiments, wherein the detection device is connected to the infrared camera.
In some embodiments, the detection system further comprises an energy detector for detecting the detection energy, and the detection device is further configured to acquire the detection energy detected by the energy detector.
In the detection method of the laser projector, the detection device of the laser projector and the detection system of the laser projector, the highlight area in the laser pattern is selected to accurately position the high-energy area of the laser projector for projecting laser, and then whether the safety standard is met can be judged by detecting the detection energy projected to the high-energy area by the laser projector, without detecting the energy of all areas in the projection range of the laser projector, so that the detection efficiency is high.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a method of detecting a laser projector according to certain embodiments of the present invention;
FIG. 2 is a schematic diagram of a detection system for a laser projector and a configuration of the laser projector according to certain embodiments of the present invention;
FIG. 3 is a schematic illustration of a laser pattern according to certain embodiments of the present invention;
FIG. 4 is a schematic diagram of a projection panel and energy detector configuration according to certain embodiments of the present invention;
FIG. 5 is a schematic flow chart of a method of detecting a laser projector according to certain embodiments of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 to 4, the detection method of the laser projector 20 according to the embodiment of the invention includes the steps of:
01: controlling the laser projector 20 to project laser light toward the predetermined plane 131;
02: acquiring a laser pattern 30 modulated by a predetermined plane 131;
03: selecting a highlight area 31 in the laser pattern 30 according to the gray information of the laser pattern 30;
04: acquiring the energy of the laser projected to the high-energy region 50 by the laser projector 20 as detection energy, wherein the high-energy region 50 is a region corresponding to the highlight region 31 on the predetermined plane 131; and
05: based on the detected energy, it is determined whether the projection energy of the laser projector 20 meets safety standards.
The detection system 10 of the laser projector 20 according to the embodiment of the present invention includes an infrared camera 11 and a detection device 12. The infrared camera 11 may be used to acquire the laser light pattern 30 modulated by the predetermined plane 131. The detection device 12 is connected to the infrared camera 11. The detection device 12 may be used to perform steps 01, 02, 03, 04, and 05. That is, the detection device 12 may be used to control the laser projector 20 to project laser light toward the predetermined plane 131; acquiring a laser pattern 30 modulated by a predetermined plane 131; selecting a highlight area 31 in the laser pattern 30 according to the gray information of the laser pattern 30; acquiring the energy of the laser projected to the high-energy region 50 by the laser projector 20 as detection energy, wherein the high-energy region 50 is a region corresponding to the highlight region 31 on the predetermined plane 131; and judging whether the projection energy of the laser projector 20 meets the safety standard or not according to the detection energy.
In the detection method of the laser projector 20 and the detection system 10 of the laser projector 20 according to the embodiment of the present invention, the highlight region 31 in the laser pattern 30 is selected to accurately locate the high energy region 50 where the laser projector 20 projects the laser, and further, the detection energy projected to the high energy region 50 by the laser projector 20 is detected to determine whether the safety standard is satisfied, without detecting the energy of all regions within the projection range of the laser projector 20, so that the detection efficiency is high.
Specifically, the detection device 12 may be a terminal such as a computer. The detection device 12 is connected to a laser projector 20. In step 01, the detection device 12 controls the laser projector 20 to project laser light, which may be infrared light, onto the predetermined plane 131, the laser light projected by the laser projector 20 may be a beam with a specific pattern, such as speckle or stripe, and the laser light is projected onto the S1 area of the predetermined plane 131. The energy of the laser projected at different positions of the region S1 may not be consistent, and there are regions where the laser energy is relatively high and relatively low, it can be understood that if the safety criterion is satisfied by detecting that the energy of the region where the laser energy is relatively high, it can be determined that the energy of the region where the laser energy is relatively low also satisfies the safety criterion.
The detection device 12 is connected to the infrared camera 11, and when step 02 is performed, the detection device 12 may obtain the laser pattern 30 collected by the infrared camera 11, and a light-sensitive surface of the infrared camera 11 may be on the same plane as a light-emitting surface of the laser projector 20. Taking the example of the laser projector 20 projecting the laser spots as an example, the laser pattern 30 obtained by the detection device 12 includes a plurality of spot patterns (such as black dots in fig. 3), each of which corresponds to one of the spots projected onto the predetermined plane 131, wherein the gray scale information of the spot pattern is also related to the energy of the corresponding spot, and the gray scale information can be obtained by reading the gray scale value of the spot pattern. Specifically, since the laser pattern 30 collected by the infrared camera 11 is a black-and-white pattern, the gray value in the area without the spot pattern is low, indicating that no spot is projected at the corresponding position of the predetermined plane 131; the higher the gray value of the area having the spot pattern indicates that the spot is projected at the corresponding position on the predetermined plane 131, and the higher the gray value is, the stronger the energy of the spot projected at the corresponding position is.
In step 03, the detecting device 12 selects the highlight region 31 in the laser pattern 30 according to the grayscale information of the laser pattern 30, in the embodiment of the present invention, the highlight region 31 in the laser pattern 30 is the region with the maximum sum of the grayscale values of a plurality of pixels in the laser pattern 30, and it is understood that the highlight region 31 may be a continuous region or may be formed by a plurality of spaced regions. The highlight region 31 may include a partial region without the spot pattern, and only the sum of the gray values of the plurality of pixels in the entire highlight region 31 is required to be maximum.
In step 04, the detecting device 12 may position the high-energy region 50 corresponding to the highlight region 31 in the predetermined plane 131 according to the distance between the infrared camera 11 and the predetermined plane 131, and the parameters such as the internal reference and the external reference of the infrared camera 11, where the highlight region 31 is the laser pattern 30 of the high-energy region 50 collected by the infrared camera 11. Since the sum of the gray values of the plurality of pixels in the highlight region 31 is the largest, the sum of the energies of the plurality of spots of the high-energy region 50 is also the largest, the energy of the laser of the high-energy region 50 is obtained as the detection energy, and if the intensity of the detection energy satisfies the safety criterion, the energies of the remaining regions will also satisfy the safety criterion.
When step 05 is implemented, the detection device 12 will determine whether the projection energy of the laser projector 20 meets the safety standard by using the detection energy, specifically, in one example, the detection device 12 may determine whether the detection energy is less than or equal to a first energy threshold, and when the detection energy is less than or equal to the first energy threshold, the projection energy of the laser projector 20 is considered to meet the safety standard; in another example, the detection device 12 may substitute the detection energy into a predetermined detection formula and calculate a value for detection, and determine whether the projection energy of the laser projector 20 satisfies the requirement by determining whether the value falls within a predetermined range.
Further, in yet another example, the detection device 12 may also determine whether the detected energy is greater than or equal to a second energy threshold, and when the detected energy is greater than or equal to the second energy threshold, the projection energy of the laser projector 20 may be determined to be sufficient for generating an accurate depth image, and when the detected energy is less than the second energy threshold, the projection energy of the laser projector 20 may be determined to be too small to generate an accurate depth image.
Referring to fig. 2 again, in the embodiment of the invention, the detecting system 10 further includes a projection plate 13, and the predetermined plane 131 is formed on the projection plate 13. The laser projector 20 projects laser light on the S1 area of the predetermined plane 131, and the infrared camera 11 acquires an infrared image of the S2 area of the predetermined plane 131, wherein the S1 area is located within the S2 area. The laser projector 20 may be an independent laser projection module, or may be a terminal including a laser projection module, such as a mobile phone, a tablet computer, a game machine, a smart watch, a head display device, or the like. The laser projector 20 and the detection device 12 may be communicatively coupled by wireless or wired means. The inspection system 10 may also include a fixture (not shown) by which the laser projector 20 is secured, and after the inspection device 12 has acquired the inspection energy, the laser projector 20 may be removed from the fixture to re-secure a new laser projector 20 to be inspected in the fixture for inspection.
Referring to fig. 2 and 4, in some embodiments, the detection system 10 further includes an energy detector 14. The energy detector 14 is used for detecting the detection energy, and the detection device 12 is also used for acquiring the detection energy detected by the energy detector 14.
The energy detector 14 may be a photoelectric converter, and the energy detector 14 may be in communication with the detection device 12, in an embodiment of the invention, the energy detector 14 is arranged on the predetermined plane 131. When the detection device 12 has not been positioned in the high energy region 50, the energy detector 14 may be positioned outside the S1 region to avoid being projected onto the laser light; after the detection device 12 is positioned in the high-energy region 50, the detection device 12 may send an instruction to the energy detector 14, the energy detector 14 moves to the high-energy region 50 according to the instruction, the laser originally projected to the high-energy region 50 is projected onto the energy detector 14, and the energy detector 14 detects the value of the detected energy and sends the value of the detected energy to the detection device 12. After receiving the value of the detection energy, the detection device 12 may send an instruction to the energy detector 14, and after receiving the instruction, the energy detector 14 moves to the outside of the S1 area again to wait for the next detection.
Of course, the energy detector 14 can be moved to the high energy region 50 manually by the user, or the energy detector 14 can be positioned in the remaining location and moved to the predetermined plane 131 when desired.
Referring to fig. 2, in some embodiments, the predetermined plane 131 is perpendicular to the optical axis of the laser projector 20, and the distance between the predetermined plane 131 and the projection of the laser projector 20 is in the range of [100, 2000] mm. For the laser projector 20 for recognizing some parts of the human body, such as for face recognition, three-dimensional modeling of the human body, etc., the range of [100, 2000] mm is a common range, and it is simulated to detect that the user will not be injured by the laser projected by the laser projector 20 in actual use by detecting whether the safety standard is satisfied when the distance between the laser projector 20 and the predetermined plane 131 is within the above range. The distance in actual detection may be any distance in the above-mentioned interval, such as 100 mm, 150 mm, 500 mm, 570 mm, 1200 mm, 1500 mm, 1800 mm, 2000 mm, and the like.
Referring to fig. 3 and 5, in some embodiments, step 03 includes step 031: the highlighted area 31 within the laser pattern 30 is selected with a predetermined graphic frame 40 to maximize the sum of the gray values of all pixels within the graphic frame 40.
Referring to fig. 2, in some embodiments, the detection device 12 may be further configured to perform step 031, that is, the detection device 12 may be configured to select the highlight region 31 in the laser pattern 30 with a predetermined frame 40, so as to maximize the sum of the grayscale values of all pixels in the frame 40.
In particular, the graphical box 40 may be a virtual tool used by the detection device 12 in locating the highlight region 31, and may not actually appear in the laser pattern 30. When a certain area is framed at an arbitrary position of the laser pattern 30 by a predetermined graphic frame 40 (predetermined size and shape), the total gray scale value can be obtained by adding the gray scale values of all pixels in the area, and when the total gray scale value is maximized, the area framed by the graphic frame 40 at this time is the highlight area 31. It can be understood that the total gray value is maximized, that is, the energy of the light spot of the high-energy region 50 corresponding to the highlight region 31 is the strongest, and the portion of the user in the high-energy region 50 is most easily damaged by the laser, as long as it is ensured that the energy of the high-energy region 50 meets the safety standard, and the rest regions all meet the safety standard.
In the embodiment shown in fig. 3, the graphic frame 40 has a circular shape, and the area outlined by the graphic frame 40 is a continuous area. It is understood that in other embodiments, the shape of the graphic frame 40 may be selected according to actual detection requirements, for example, the graphic frame 40 may be square, oval, etc., and the graphic frame 40 may also be composed of a plurality of sub-graphic frames distributed at intervals, for example, the graphic frame 40 is composed of a plurality of circular sub-graphic frames distributed at intervals.
Referring to FIG. 3, in some embodiments, the graphics frame 40 is circular, and the diameter of the graphics frame 40 is 7 mm. For the laser projector 20 that needs to project laser light to human face, it is particularly necessary to control the amount of laser energy projected to the pupil of human eye to ensure that the human eye is not injured. The graphic frame 40 is circular and the graphic frame 40 has a diameter of 7 mm, and the corresponding high energy region 50 may be used to simulate the shape and size of a human eye pupil when the user uses the laser projector 20. Therefore, the laser light projected by the laser projector 20 can be detected in a targeted manner without harming human eyes. Of course, in other embodiments, the diameter of the graphic frame 40 may be selected to have other values, such as 3.5 mm, 14 mm, etc., for different testing requirements.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A method of inspecting a laser projector, the method comprising:
controlling the laser projector to project laser to a preset plane of a projection plate, wherein the preset plane is vertical to an optical axis of the laser projector;
acquiring a laser pattern modulated by the predetermined plane;
selecting a highlight area in the laser pattern according to the gray information of the laser pattern;
acquiring energy of laser projected to a high-energy area by the laser projector through an energy detector to serve as detection energy, wherein the high-energy area is an area corresponding to the high-brightness area on the preset plane, the energy detector can move to the high-energy area, and the high-energy area is determined according to the distance between an infrared camera and the preset plane and internal and external parameters of the infrared camera; and
judging whether the projection energy of the laser projector meets the safety standard or not according to the detection energy;
the positioning the highlight area in the laser pattern according to the gray scale information of the laser pattern comprises:
and selecting a highlight area in the laser pattern by using a preset graphic frame so as to maximize the sum of the gray values of all pixels in the graphic frame, wherein the graphic frame is matched with the projection shape of the energy detector on the preset plane.
2. The detection method according to claim 1, wherein the predetermined plane is at a distance in the range of [100, 2000] mm from the projection plane of the laser projector.
3. The detection method according to claim 1, wherein the graphic frame is circular and has a diameter of 7 mm.
4. A detection arrangement for a laser projector, the detection arrangement being arranged to:
controlling the laser projector to project laser to a preset plane of a projection plate, wherein the preset plane is vertical to an optical axis of the laser projector;
acquiring a laser pattern modulated by the predetermined plane;
selecting a highlight area in the laser pattern according to the gray information of the laser pattern;
acquiring energy of laser projected to a high-energy area by the laser projector through an energy detector to serve as detection energy, wherein the high-energy area is an area corresponding to the high-brightness area on the preset plane, the energy detector can move to the high-energy area, and the high-energy area is determined according to the distance between an infrared camera and the preset plane and internal and external parameters of the infrared camera; and
judging whether the projection energy of the laser projector meets the safety standard or not according to the detection energy;
the detection device is further configured to:
and selecting a highlight area in the laser pattern by using a preset graphic frame so as to maximize the sum of the gray values of all pixels in the graphic frame, wherein the graphic frame is matched with the projection shape of the energy detector on the preset plane.
5. The detection apparatus as claimed in claim 4, wherein the predetermined plane is perpendicular to the optical axis of the laser projector, the predetermined plane being at a distance from the projection plane of the laser projector in the range of [100, 2000] mm.
6. The detecting device for detecting the rotation of a motor rotor according to claim 4, wherein the figure frame is circular, and the diameter of the figure frame is 7 millimeters.
7. A detection system for a laser projector, the detection system comprising:
an infrared camera for collecting the laser pattern modulated by the predetermined plane; and
the detection device of any one of claims 4 to 6, connected to the infrared camera.
8. The detection system according to claim 7, further comprising an energy detector for detecting the detection energy, wherein the detection device is further configured to acquire the detection energy detected by the energy detector.
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| CN201810745982.5A CN108760059B (en) | 2018-07-09 | 2018-07-09 | Detection method, detection device and detection system of laser projector |
| PCT/CN2019/070680 WO2020010829A1 (en) | 2018-07-09 | 2019-01-07 | Detection method, apparatus and system for laser projector |
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| CN201810745982.5A CN108760059B (en) | 2018-07-09 | 2018-07-09 | Detection method, detection device and detection system of laser projector |
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| CN108760059B (en) * | 2018-07-09 | 2021-06-04 | Oppo广东移动通信有限公司 | Detection method, detection device and detection system of laser projector |
| CN109115333A (en) * | 2018-08-06 | 2019-01-01 | Oppo广东移动通信有限公司 | The detection method and detection system of laser projecting apparatus |
| US11508275B1 (en) | 2022-01-18 | 2022-11-22 | Google Llc | Laser energy integrator for display waveguide breakage safety system |
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| CN108760059A (en) | 2018-11-06 |
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